84 



VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



circulating the air, passing it through the purifying agents, etc. The 

 lungs are thus relieved of the labor forced upon them by many types of 

 respiratory apparatus, and breathing is as free and untrammeled as 

 is possible with any form of 

 breathing appliance. The uni- 

 versal respiration apparatus 

 requires a positive blower for 

 the circulation of the ventilat- 

 ing air current, since considera- 

 ble pressure is necessary to pass 

 the air through the sulphuric 

 acid used to remove the water 

 vapor, but the absorbents em- 

 ployed in the new apparatus 

 (calcium chloride and soda 

 lime) offer no material resist- 

 ance; accordingly a small 

 rotary air-impeller may be 

 successfully utilized. For this 

 purpose a small hair-drier is 

 employed which moves a con- 

 siderable volume of air, but 

 can not give positive pressure. 

 This hair-drier is light in weight 

 and provided with a universal 

 motor so that it can be used 

 with either alternating or direct 

 current.^ The blower must be 

 oiled at least every other day when in 

 constant use. To avoid possible leaks 

 the blower is placed inside the spi- 

 rometer. 



AIR-CIRCUIT. 



By reference to figures 2 and 3, it 

 may be seen that the air leaving the 

 mouth of the subject is drawn along a 

 wide tube, G, enters the spirom- 

 eter, and is discharged by the air 

 impeller, a, into a calcium-chloride 



^ The hair-drier, which is manufactured by the 

 Arnold Electric Co., of Racine, Wisconsin, is 

 purchased without switch, heating unit, or handle, 

 and slightly modified by adding a discharge tube 

 to support the drier when in position inside the 

 spirometer. 



Fig. 3. — Spirometer and 

 absorbing system of port- 

 able respiration appa- 

 ratus. 



G, large-caliber pipe con- 

 ducting expired air to spi- 

 rometer; o, air-impeller; 

 C, first water-absorber ; Z), 

 carbon-dioxide absorber; 

 E, second water-absorber; 

 S, point at which rate of 

 ventilation may be tested 

 by disconnecting coup- 

 ling; W, pipe conducting 

 purified air to subject; P, 

 pet-cock for introduction 

 of oxygen; T, thermome- 

 ter for obtaining records 

 of temperature of spiro- 

 meter. The spirometer 

 bell is counterpoised by 

 the weight, X, attached 

 to silk thread passing 

 over aluminum wheel, Z. 

 Scale on which pointer 

 indicates height of spi- 

 rometer bell is shown at 

 right of the weight X. 



Yi . I 1 1 n /° I H 1 1 1 . f P CM 



